WW2010
University of Illinois

WW2010
 
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Online Guides
 
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Meteorology
 
  introduction
 
  air masses, fronts
 
  clouds, precipitation
 
  el nino
 
  forces, winds
 
  hurricanes
 
  hydrologic cycle
 
  light, optics
 
  midlatitude cyclones
 
> severe storms
 
  weather forecasting

Severe Storms
 
  introduction
 
  dangers of t-storms
 
  types of t-storms
 
  tstorm components
 
> tornadoes
 
  modeling

Tornadoes
 
  introduction
 
  useful diagrams
 
  low-level flow
 
  evolution (photos)
 
> cyclic storms

Cyclic Storms
 
  introduction
 
> more tornadoes

User Interface
 
  graphics
> text

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More Tornadoes
produced by cyclic storms

Yet another cyclic storm, looking towards the northwest. Visibilities and contrast were low in this northern Kansas storm, but we can make out a distant, rope-like tornado just left of center (about 6 miles to our west-northwest, and a wall cloud and developing funnel on the extreme right, about 3 miles to the north-northwest.

[Image: (65K)]
Photograph by: Moller

Minutes later, tornado #2 has touched down to our north-northwest whereas tornado #1 has lifted. This second tornado was producing significant damage at this time.

[Image: (61K)]
Photograph by: Moller

Moving closer, we are looking north from within 1/2 mile at tornado #2. It was changing rapidly in appearance as it quickly evolved into a large multiple vortex tornado. The huge vortex to the right of the road developed and dissipated within a minute, as another sub-vortex was forming to the left of the road. The tornado had become violent and leveled several farms. Early warnings were provided by excellent spotter reports.

[Image: (68K)]
Photograph by: Moller

Below is a storm which seemed to defy most of what we have said about cyclic storms! Looking north, note tornado #1 (with clear slot) at the south end of the precipitation area, tornado #2 east of the precipitation (extreme right), and wall cloud/developing tornado #3 in the visual distance between #1 and #2, and northeast of the precipitation area!

[Image: (62K)]
Photograph by: NSSL

Thus, instead of a 20 minute gap we have concurrent mesocyclones on three different thunderstorm flanks! There are always exceptions to just about any "rule of thumb" we can make about severe thunderstorms.



introduction
Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.

Modeling